An acid mist treatment device for a sulfuric acid production plant

Abstract

The utility model relates to sulphuric acid production technical field, concretely for a kind of acid mist treatment device for sulphuric acid production equipment, including tower body, the bottom side of tower body is fixed with the gas inlet pipe for introducing acid-containing waste gas, the top of tower body is fixed with the exhaust pipe for discharging gas after purification;By setting excitation component and flow guide component, high-frequency micro-vibration of driving packing is resonated by using airflow kinetic energy driving support ring cooperation fixed rope, break static thick liquid film, promote absorption liquid update, substantially improve gas-liquid contact and mass transfer efficiency, neutralization reaction is more thorough, simultaneously, the mechanical impact force generated by vibration, prevent impurity deposition, shake broken salt crystal, avoid packing blockage, extend cleaning cycle, reduce operation and maintenance cost, improve equipment stability and service life, in addition, grid plate automatically adjusts inclination angle with airflow pressure, guide airflow to pass through smoothly, simultaneously, the contact time of airflow and packing surface liquid film is extended by the generated cyclone energy.

Description

Technical Field

[0001] This utility model relates to the field of sulfuric acid production technology, and in particular to an acid mist treatment device for sulfuric acid production equipment. Background Technology

[0002] The sulfuric acid production process generates waste gas containing sulfur dioxide, sulfur trioxide, and sulfuric acid mist, which needs to be treated with appropriate acid mist treatment equipment. As a commonly used acid mist treatment equipment, the spray purification tower has become the core purification device in scenarios such as sulfuric acid production tail gas treatment due to its advantages of high efficiency, stability, low operating cost, and simple operation. It achieves waste gas purification through the synergistic effect of physical absorption and chemical neutralization.

[0003] A hydrochloric acid mist treatment device disclosed in Chinese Patent Publication No. CN223439551U uses negative pressure traction to non-contactly traction the acid mist and constructs an acid mist dispersion structure to improve the combination effect and sufficiency of the acid mist. However, according to hydrochloric acid mist treatment devices provided in related fields and existing technologies: in traditional acid mist treatment devices, a static thick liquid film easily forms on the surface of the packing, hindering the diffusion of acidic components, resulting in insufficient gas-liquid contact and inefficient neutralization reaction; at the same time, the airflow is unevenly distributed in the gaps between the packing, which easily generates channeling, and unreacted acid mist is directly discharged, resulting in poor overall purification effect; in addition, acid mist impurities and reactant salt crystals easily deposit and clog the pores of the packing, increasing airflow resistance, reducing treatment capacity, and requiring frequent shutdowns for cleaning. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide an acid mist treatment device for sulfuric acid production equipment.

[0005] The purpose of this utility model is achieved through the following technical solution: an acid mist treatment device for sulfuric acid production equipment, including a tower body, an inlet pipe for introducing acidic waste gas is fixedly provided on one side of the bottom of the tower body, an exhaust pipe for discharging purified gas is fixedly provided on the top of the tower body, two mass transfer components for providing gas-liquid contact carriers are arranged longitudinally inside the tower body, and a spray component for uniformly spraying alkaline absorbent liquid onto the mass transfer components is provided on the side of the tower body away from the inlet pipe. The mass transfer assembly includes a first packing, a second packing, and a third packing arranged longitudinally inside the tower body. The bottom of the first packing, the second packing, and the third packing is provided with an excitation assembly for driving the vibration of the corresponding packing by means of air kinetic energy. Each set of excitation assemblies is provided with a flow guiding assembly for guiding the airflow.

[0006] Preferably, the vibration assembly includes a support ring, the outer surface of which is fixed to the inner wall of the tower body by multiple fixing ropes, and multiple support blocks are fixedly provided at intervals on the top edge of the support ring, and the support ring has a hollow structure.

[0007] Preferably, the flow guiding assembly includes a plurality of flow guiding grids formed on the surface of the support ring, each of the plurality of flow guiding grids having a grid plate inside, and a spring hinge pin fixed at the middle position of each grid plate, and each grid plate being hinged to the interior of the flow guiding grid through the spring hinge pin.

[0008] Preferably, the plurality of the flow guide grids are arranged in a circumferential array, and each of the spring hinge shafts is arranged radially along the support ring.

[0009] Preferably, all of the grid plates are inclined, and the inclination angles are consistent.

[0010] Preferably, the spray assembly includes a water tank fixed to the outside of the tower body, a water pump fixedly installed on the top of the water tank, a water supply pipe fixedly installed at the outlet end of the water pump, a water distribution pipe fixedly installed above each mass transfer assembly, and a sprayer fixedly installed at the end of each water distribution pipe, with the sprayer located directly above the first packing material.

[0011] Preferably, the first packing is internally fitted with convex polyhedral packing, the second packing is internally fitted with Pall ring packing, and the third packing is internally fitted with stepped ring packing. The beneficial effects of the acid mist treatment device for this sulfuric acid production equipment are as follows: By setting up excitation components and flow guiding components, the air kinetic energy drives the support ring to resonate with the fixed rope, causing the packing to vibrate at high frequency. This breaks the static thick liquid film, promotes the renewal of the absorbent, and significantly improves the gas-liquid contact and mass transfer efficiency, resulting in a more thorough neutralization reaction. At the same time, the mechanical impact force generated by the vibration prevents impurities from depositing, breaks up salt crystals, avoids packing blockage, extends the cleaning cycle, reduces operation and maintenance costs, and improves equipment stability and service life. In addition, the grid plate automatically adjusts its tilt angle according to the airflow pressure, guiding the airflow to pass smoothly. Meanwhile, the generated swirling energy prolongs the contact time between the airflow and the liquid film on the packing surface, allowing the airflow to penetrate more fully into the gaps between the packing, thereby increasing the neutralization reaction rate of acidic components and alkaline absorbent. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the internal structure of the tower body of this utility model; Figure 3 This is a schematic diagram showing the disassembled flow guiding component and vibration excitation component of this utility model; Figure 4 This is a partial cross-sectional view of the support ring of this utility model; Figure 5 This is a schematic diagram of the state of the grid plate of this utility model at the initial angle; Figure 6 This is a schematic diagram showing the state of the grid plate of this utility model when it is blown by airflow; Figure 7 This is a schematic diagram of the structure of the sprayer of this utility model.

[0014] In the diagram: 1. Tower body; 2. Air inlet pipe; 3. Exhaust pipe; 4. Spray assembly; 41. Water tank; 42. Water pump; 43. Water supply pipe; 44. Water distribution pipe; 45. Sprayer; 5. Vibration assembly; 51. Support ring; 52. Fixing rope; 53. Support block; 6. Mass transfer assembly; 61. First packing; 62. Second packing; 63. Third packing; 7. Flow guiding assembly; 71. Flow guiding grid; 72. Grid plate; 73. Spring hinge shaft. Detailed Implementation

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, and in part will be obvious from the description or may be learned by practice of the invention.

[0017] like Figures 1 to 7As shown, an acid mist treatment device for sulfuric acid production equipment includes a tower body 1. An inlet pipe 2 for introducing acid-containing waste gas is fixedly installed on one side of the bottom of the tower body 1. An exhaust pipe 3 for discharging purified gas is fixedly installed on the top of the tower body 1. Two mass transfer components 6 for providing gas-liquid contact carriers are longitudinally arranged inside the tower body 1. A spray component 4 for uniformly spraying alkaline absorbent onto the mass transfer components 6 is located on the side of the tower body 1 away from the inlet pipe 2. The mass transfer components 6 include a first packing 61, a second packing 62, and a third packing 63 longitudinally arranged inside the tower body 1. Each of the first packing 61, second packing 62, and third packing 63 has a vibration component 5 at its bottom for driving the corresponding packing to vibrate using airflow energy. Each vibration component 5 has a guide component 7 for guiding the airflow through. After the acidic waste gas enters the bottom of the tower body 1 through the inlet pipe 2, it flows upward under the negative pressure of the external fan and passes through two sets of mass transfer components 6 in sequence. During this process, the spray component 4 sprays alkaline absorbent liquid onto the packing, forming a continuous liquid film on the surface of the first packing 61, the second packing 62 and the third packing 63 in sequence. The acidic components in the acid mist react with the absorbent liquid. At the same time, the vibration component 5 drives the corresponding packing to vibrate through the airflow. This not only breaks the static liquid film boundary layer and greatly improves the gas-liquid contact efficiency, but also avoids the deposition of fine impurities between the packing particles and reduces the risk of local blockage. Finally, the purified gas is discharged through the exhaust pipe 3, and the reaction products flow into the bottom circulation system of the tower with the absorbent liquid. In addition, the flow guiding component 7 can guide the airflow through the vibration component 5 and reduce the resistance of the airflow through the vibration component 5.

[0018] like Figures 2 to 4 As shown, the vibration assembly 5 includes a support ring 51 with a hollow structure. The outer surface of the support ring 51 is fixed to the inner wall of the tower body 1 by multiple fixing ropes 52. Multiple support blocks 53 are fixed at intervals on the top edge of the support ring 51 to stabilize and support the corresponding packing. When the acidic waste gas flows upward under negative pressure, the airflow will impact the support ring 51. When the support ring 51 is impacted, since the support ring 51 is connected to the inner wall of the tower body 1 by multiple fixing ropes 52, and the fixing ropes 52 have a certain degree of elasticity and flexibility, they cannot completely restrict the small displacement of the support ring 51. The support ring 51 will generate periodic vibrations, which will be transmitted to the first packing 61, the second packing 62 and the third packing 63 above through the support block 53. This will enable the corresponding packing to vibrate by means of air kinetic energy. This vibration can not only break the static liquid film on the surface of the packing, effectively prevent the absorbent from forming a thick liquid film on the surface of the packing and promote the renewal of the absorbent, but also optimize the distribution of the gas and liquid phases in the gaps between the packing, suppress channeling, and greatly improve the gas-liquid contact efficiency. At the same time, the generated vibration can also prevent the packing pores from being blocked by salt crystals and significantly improve the diffusion rate of acidic components into the absorbent.

[0019] like Figures 3 to 6As shown, the flow guiding assembly 7 includes multiple flow guiding grids 71 ​​formed on the surface of the support ring 51. These grids 71 ​​are arranged in a circumferential array, and each grid 71 has a grid plate 72 inside. A spring hinge shaft 73 is fixedly installed at the center of each grid plate 72. Each grid plate 72 is hinged to the interior of the flow guiding grid 71 via the spring hinge shaft 73. All grid plates 72 are inclined at the same angle. The spring hinge shaft 73 is arranged radially along the support ring 51. The grid plates 72 have the same shape as the flow guiding grids 71, and there is a gap between the edge of the grid plate 72 and the groove wall of the flow guiding grid 71, allowing the grid plate 72 to rotate smoothly around the spring hinge shaft 73. When the acidic waste gas flows upward through the flow guiding assembly... When the airflow is in position 7, it also acts on the grid plate 72. Under the pressure of the airflow, the grid plate 72 will overcome the elastic force of the spring hinge shaft 73 and rotate around the spring hinge shaft 73. The tilt angle is automatically adjusted according to the changes in airflow speed and pressure. The rotation of the grid plate 72 can guide the airflow through the guide grid 71 along the tilt direction of the grid plate 72. The guidance of the airflow by the grid plate 72 can make the airflow form a spiral upward flow state in the packing area. This swirling flow can prolong the contact time between the airflow and the liquid film on the packing surface, allowing the airflow to penetrate into the packing gaps more fully, thereby increasing the neutralization reaction rate of acidic components and alkaline absorbent. At the same time, the blowing of the airflow on the grid plate 72 can act on the support ring 51, providing driving force for its vibration.

[0020] like Figure 1 , Figure 2 and Figure 7 As shown, the spray assembly 4 includes a water tank 41 fixed to the outside of the tower body 1. A water pump 42 is fixedly installed on the top of the water tank 41. A water supply pipe 43 is fixedly installed at the outlet end of the water pump 42. A water distribution pipe 44 is fixedly installed above each group of mass transfer components 6 corresponding to the water supply pipe 43. A sprayer 45 is fixedly installed at the end of each water distribution pipe 44. The sprayers 45 are all located directly above the corresponding first packing 61. The water pump 42 pressurizes the alkaline absorbent liquid in the water tank 41 and sends it into the water supply pipe 43. The water distribution pipe 44 distributes it to each sprayer 45. Finally, the sprayer 45 disperses the absorbent liquid into fine droplets, which uniformly cover the packing area. After the droplets fall, they adhere to the surface of the packing to form a continuous and uniform liquid film, providing a sufficient reaction interface for the gas and liquid phases.

[0021] like Figure 1 and Figure 2As shown, the internal packing structures of the first packing 61, the second packing 62, and the third packing 63 are different. The first packing 61 is equipped with convex polyhedral packing, the second packing 62 is equipped with Pall ring packing, and the third packing 63 is equipped with stepped ring packing, forming an upper, middle, and lower gradient packing structure. This gradient structure is adapted to the distribution characteristics of acid mist concentration, which is high at the bottom and low at the top, to achieve graded treatment of acid mist. Due to the stepped port design, the lower stepped ring packing has a large porosity and anti-clogging properties, which can preferentially treat the high concentration of acid mist with a small amount of impurities at the inlet, avoiding packing blockage. The annular structure of the middle Pall ring packing makes the airflow distribution more uniform, and enhances the main reaction process through gas-liquid turbulence, removing most of the acid components. The multifaceted structure of the upper convex polyhedral packing provides a larger specific surface area, which can finely purify the low concentration of acid mist remaining in the rising airflow, ensuring that the treated gas meets the emission standards. This gradient design not only ensures purification efficiency but also extends the overall service life of the packing.

[0022] The work process is as follows: S1: As Figure 2 As shown, under the negative pressure generated by the external fan, the acidic waste gas enters the tower body through the air inlet pipe 2 at the bottom of the tower body 1, forming a stable upward airflow. The negative pressure driving force ensures that the waste gas flows longitudinally along the tower body, providing a power basis for full contact with the absorbent liquid in the future. At the same time, it guides the waste gas to flow through the functional components of each level in the tower in sequence to achieve orderly purification. S2: As Figures 2 to 4 As shown, the upward-flowing acidic waste gas impacts the support ring 51. Since the support ring 51 is connected to the inner wall of the tower body 1 by the elastic and flexible fixing rope 52, it cannot completely restrict its small displacement. Under the continuous impact of the airflow, the support ring 51 converts the aerodynamic energy into periodic vibration, which is then transmitted to the first packing 61, the second packing 62, and the third packing 63 above through the support block 53. The vibration breaks the static liquid film boundary layer on the surface of the packing, avoids the formation of a thick liquid film, promotes the renewal of the absorbent liquid and gas-liquid turbulence, and prevents salt crystallization and impurity deposition in the pores of the packing through mechanical vibration, suppresses channeling phenomenon, and optimizes the distribution of gas and liquid in the gaps between the packing. S3: As Figures 3 to 6 As shown, when the airflow passes through the excitation assembly 5, it also acts on the grid plate 72. Under the action of airflow pressure, the grid plate 72 rotates around the radial spring hinge shaft 73 and automatically adjusts the tilt angle according to the airflow speed and pressure. The dynamic adjustment of the grid plate 72 guides the airflow through the guide grid 71 along the tilt direction, so that the airflow forms a spiral upward swirling state in the packing area, prolongs the contact time between the airflow and the liquid film on the packing surface, increases the penetration depth of the airflow into the packing gap, and enhances the gas-liquid mass transfer effect. At the same time, the blowing of the airflow on the grid plate 72 can act on the support ring 51, providing driving force for its vibration. S4: As Figure 2 and Figure 7As shown, the water pump 42 pressurizes the alkaline absorbent liquid in the water tank 41 and sends it into the water supply pipe 43. The water is then distributed to each sprayer 45 through the water distribution pipe 44. Finally, the absorbent liquid is dispersed into fine droplets through the sprayer 45, which uniformly cover the packing area. After the droplets fall, they adhere to the surface of the packing, forming a continuous and uniform liquid film, providing a sufficient reaction interface for the gas and liquid phases. S5: As Figure 2 As shown, the acidic waste gas passes through the gradient structure composed of the third packing 63 (stepped ring packing), the second packing 62 (Pall ring packing), and the first packing 61 (convex polyhedral packing) from bottom to top, thereby achieving graded treatment of acid mist and gradient improvement of purification efficiency. S6: As Figure 2 As shown, during the rising process, the acid mist comes into full contact with the alkaline absorbent film on the surface of the two sets of packing materials. The acidic components undergo a neutralization reaction with the absorbent. Finally, the purified gas is discharged from the exhaust pipe 3 at the top of the tower body 1. The salt products produced by the neutralization reaction and the unreacted absorbent flow into the bottom circulation system of the tower under the action of gravity, realizing gas-liquid separation and recycling of absorbent, ensuring the continuity and environmental friendliness of the purification process.

[0023] The water pump 42 in this application is a well-known technology in this field, therefore its specific structure and working principle are not described in detail.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An acid mist treatment device for sulfuric acid production equipment, characterized in that: The tower body (1) includes an air inlet pipe (2) fixed on one side of the bottom of the tower body (1) for introducing acidic waste gas, an exhaust pipe (3) fixed on the top of the tower body (1) for discharging purified gas, two mass transfer components (6) for providing gas-liquid contact carriers are arranged longitudinally inside the tower body (1), and a spray component (4) for uniformly spraying alkaline absorbent liquid onto the mass transfer components (6) is arranged on the side of the tower body (1) away from the air inlet pipe (2). The mass transfer component (6) includes a first packing (61), a second packing (62) and a third packing (63) arranged longitudinally inside the tower body (1). The bottom of the first packing (61), the second packing (62) and the third packing (63) are provided with an excitation component (5) for driving the vibration of the corresponding packing by means of air kinetic energy. Each set of excitation components (5) is provided with a flow guiding component (7) for guiding the airflow.

2. The acid mist treatment device for sulfuric acid production equipment according to claim 1, characterized in that: The excitation assembly (5) includes a support ring (51). The outer surface of the support ring (51) is fixed to the inner wall of the tower body (1) by multiple fixing ropes (52). Multiple support blocks (53) are fixed at intervals on the top edge of the support ring (51). The support ring (51) has a hollow structure.

3. The acid mist treatment device for sulfuric acid production equipment according to claim 2, characterized in that: The flow guiding assembly (7) includes a plurality of flow guiding grids (71) formed on the surface of the support ring (51). Each of the plurality of flow guiding grids (71) has a grid plate (72) inside. A spring hinge (73) is fixedly provided at the middle position of each grid plate (72). Each grid plate (72) is hinged to the interior of the flow guiding grid (71) through the spring hinge (73).

4. The acid mist treatment device for sulfuric acid production equipment according to claim 3, characterized in that: The multiple flow guide grids (71) are arranged in a circumferential array, and each of the spring hinge shafts (73) is arranged radially along the support ring (51).

5. The acid mist treatment device for sulfuric acid production equipment according to claim 3, characterized in that: All of the grid plates (72) are inclined, and the inclination angle is consistent.

6. The acid mist treatment device for sulfuric acid production equipment according to claim 1, characterized in that: The spray assembly (4) includes a water tank (41) fixed to the outside of the tower body (1). A water pump (42) is fixedly installed on the top of the water tank (41). A water supply pipe (43) is fixedly installed at the outlet end of the water pump (42). A water distribution pipe (44) is fixedly installed above each mass transfer assembly (6) corresponding to the water supply pipe (43). A sprayer (45) is fixedly installed at the end of each water distribution pipe (44). The sprayer (45) is located directly above the first packing material (61).

7. The acid mist treatment device for sulfuric acid production equipment according to claim 1, characterized in that: The first packing (61) is internally fitted with convex polyhedral packing, the second packing (62) is internally fitted with Pall ring packing, and the third packing (63) is internally fitted with stepped ring packing.

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